vulnerable to any changes3. These changes occurred in 1960 when the Soviet Union decided to use the fresh water from the two rivers that fed the Aral Sea‚ the Amu Darya and Syr Darya‚ to irrigate cotton plantations in Uzbekistan. By 1980 the irrigated area in the Aral Sea basin was 6.5 million hectares which required all the water from the Amu Darya and Syr Darya. These rivers in 1961 provided 55 km3 in fresh water every year to the Aral Sea. However by 1987 once all the cotton irrigation canals were
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Empirical Formula of Copper (II) Chloride Gabriella Jane Lukas B1401404 HELP University Empirical Formula of Copper (II) Chloride Objectives 1. To validate that the empirical formula of copper (II) chloride is . 2. To calculate the percent composition of copper in copper (II) chloride. 3. To illustrate the Law of Constant Composition in copper (II) chloride. 4. To study the reaction between copper (II) chloride solution and aluminium metal. Introduction One of the most fundamental statements
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Atomic structure: scientists 1. Democritus: 1st person to think of atom (500 BCE)- philosopher Atom is the smallest piece of an element that has same properties as the element. 2. Lavisier: Law of conservation of mass/ matter • Mass can’t be created or destroy; same amount of stuff 3. Joseph Proust: Law of constant composition (law of definite Proportions) • A compound is always made of the same elements in the same ratio. 4. John Dalton: English school teacher who derived the atomic theory
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Chemistry 200 Exam 1 Review Problems 1. Calculate the number of atoms in 10.0 grams of Fe. 2. Give the mass number‚ #protons‚ #neutrons and #electrons for the isotope strontium-88. 3. Calculate the number of moles of carbon in 50.0 g of benzene C6H6 4. A substance is found to be 38.7 % C‚ 9.7 % H and 51.6 % O by mass. Its molar mass is 62.1 g/mole. What is its molecular formula? 5. Name the following: a) Ca(OH)2 b) KCN c) HClO4(aq) d) FeSO4 e) Na2O f) SF6 g)
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to commit this offense‚ especially if working on a paper at last minute trying to make a deadline. There’s no excuse for anyone to do be dishonest and used someone else hard work. I wrote my most resent essay for my Hazardous Material class here in AMU. I was given several questions and I had to research and answer them in an essay format. The guidelines that I found easier to follow was critical thinking and critical reading. I found them straightforward because throughout the course of researching
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My Element: Gold Origin of name: From the Old English word geolo (yellow) Symbol: Au Atomic Number: 79 Atomic Mass: 196.96655 amu Group/section: Gold is element number 79 found in group 11 period 6 Electron configuration: [Xe] 4f14 5d10 6s1 Valence electrons: 1 Physical or chemical properties: Color: gold Crystal Structure: Cubic Density at 293 K: 19.32 g/cm3 Melting Point: 1064.43 °C (1337.5801 K‚ 1947.9741 °F) Boiling Point: 2807.0 °C (3080.15 K‚ 5084.6 °F) Number of Neutrons: 118
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Copper is involved in the formation of red blood cells. These enzymes in turn produce cellular energy and regulate nerve transmission‚ blood clotting‚ and oxygen transport. Name: Copper Symbol: Cu Atomic Number: 29 Atomic Mass: 63.546 amu Melting Point: 1083.0 °C (1356.15 K‚ 1981.4 °F) Boiling Point: 2567.0 °C (2840.15 K‚ 4652.6 °F) Number of Protons/Electrons: 29 Number of Neutrons: 35 Classification: Transition Metal Crystal Structure: Cubic Density @ 293 K: 8.96 g/cm3
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References: AMU (n.d.). Vito Genovese. American Military University. Retrieved from http://www.lacndb.com/php/Info.php?name=Vito Genovese American Mafia (n.d.). Retrieved from http://www.lacndb.com/Info.php?name=Family - Genovese (Luciano‚ Morello) Bruno‚ A (2010)
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Even though the irrigation of the desert did wonders to the farming industry‚ it has left the Aral Sea a complete disaster. The Aral Sea is located in the northern part of Uzbekistan and the southern part of Kazakhstan‚ and primarily fed by the Amu-Darya River from the South and the Syr-Darya River from the North. Uzbekistan and Kazakhstan were part of the former Soviet Union during the 1960s‚ the time when they began to divert the rivers flow of water. This caused the surface level of the lake
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MOLE UNIT REVIEW WORKSHEET 1. Convert 500.0 g NaCl to formula units. 5.15 x 1024 f.u. Convert 9.8 x 1024 molecules of C2H6 to grams. 4.9 x 102 g The mass of an unknown gas is 11.59 g. The mass of an equal volume of He is 1.45 g. Calculate the molar mass of the unknown gas. 32.0 g/mol Calculate the percentage composition of sulphur in Al2(SO4)3. 28.11% Calculate the molar mass of Co2(SO4)3•6H2O 514.16 g/mol The empirical formula for a compound is C2H5O and its molecular mass
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